Psychiatric window construction



Aug. 26, 1952 J. F. HEINTZEL PSYCHIATRIC WINDOW CONSTRUCTION 3Sheets-Sheet 1 Filed July 11, 1949 a v m' INVENTOR.

JOSEPH F. HEINTZEL BY 4 ATTORNEYS g- 26, 1952 J. F. HEINTZEL 2,608,251

PSYCHIATRIC WINDOW CONSTRUCTION Filed July 11, 1949 5 Sheets-Sheet 2FIG.3.

FIG.6.

INVENTOR. JOSEPH F. HEINTZEL \IB4 I WWW ATTORNEYS 26, 1952 J. F.HEINTZEL PSYCHIATRIC WINDOW CONSTRUCTION 3 Sheets-Sheet 5 Filed July 11.1949 O QE m3 wmm NNN 1 Ohm mmm. mmm

NON

INVENTOR.

JOSEPH F. HEINTZEL BYW ATT RNEYS Patented Aug. 26, 1952 PSYCHIATRICWINDOW CONSTRUCTION Joseph F. Heintzel, Erie, Pa., assignor to DetroitSteel Products Company, Detroit, Mich, a corporation of MichiganApplication July 11, 1949, Serial No. 104,088

19 Claims. 1

The present invention relates to psychiatric window construction andmore particularly to a psychiatric screen for use therein.

It is an object of the present invention to provide a psychiatric screencharacterized by its ability to resume its normal shape afterdisplacement by forces applied thereto from the room side.

' More specifically, it is an object of the present invention to providea psychiatric screen, the borders of which are concealed behind aninwardly extending flange provided at the room side of the screen, theedges of the screen being displaceable outwardly away from the weatherside of the flanges upon the application of force to the room side ofthe screen.

It is a feature of the present invention to provide psychiatric screenconstruction comprising a rigid frame, screen cloth shaped to close theopening of the frame and provided along its edges with separateunconnected strips and resilient tensioning means connecting the edge ofthe screen cloth to the adjacent bars of the frame.

It is a further feature of the present invention to provide apsychiatric screen comprising a rigid frame, screen cloth filling theopening in the frame, border strips at the edges of the screen cloth,said strips comprising channel portions, and resilient meansinterconnecting the strips; and bars of the frame, said resilient meanscomprising compression springs received within the channels in thestrips.

Other objects and features of the invention will become apparent as thedescription pro- .ceeds, especially when taken in conjunction with theaccompanying drawings, wherein:

Figure l is a fragmentary vertical section through a psychiatric windowconstructed in accordance with the present invention.

Figure 2 is an enlarged sectional view illustrating the detailedconstruction of the screen frame and associated elements.

Figure 3 is a fragmentary section on the line 3-3, Figure 1.

Figure 4 is a transverse section through a portion of a modified form ofpsychiatric screen.

Figure 5 is a fragmentary elevation of the structure illustrated inFigure 4.

Figure 6 is a transverse section through a portion of another modifiedform of psychiatric screen.

Figure 7 is a transverse section through a portion of still anothermodified form of psychiatric screen.

Figure 8 is a fragmentary horizontal sectional view through a modifiedconstruction.

Figure 9 is a fragmentary sectional View showing yet anothermodification of the structure.

Figure 10 is a fragmentary sectional view showing yet anothermodification of the structure.

The use of screens in place of bars in psychiatric wards has increasedadvantages, among which is the fact that the screens are in appear--ance no different from ordinary window screens so that the inmate is notconstantly reminded of the fact that he is under restraint. However, inmany cases these screens are subject to considerable abuse. If thepatient is violent he may in many cases beat upon the screen or throwhimself against the screen so that it must be able to withstandrelatively strong forces applied from the room side thereof. Moreover,

while it is essential that the screen shall be made in such a manner asto give or yield somewhat when force is applied, it is also essentialthat the. screen resume its original condition and appearance after .theapplication of such force is discontinued. It is also essential that thescreen be designed in such manner that its operation cannot, bedestroyed by abuse. Thus for example, certain types of patients mayendeavor to stuff cloth, paper or other material into any opening orcrevices which are present.

The present screen has been designed to take care of the foregoingrequirements and to present a screen which is at once pleasing inappearance and economical to construct.

Referring now to Figures 1-3 there is illustrated a psychiatric windowadapted to be applied to an opening in a building. The windowconstruction includes casing elements comprising an upper transverseelement IQ, a lower transverse element l2, and vertical side elements I4and IS. The elements [0, l2, I l and I6 are preferably interconnected attheir corners or at all events, are rigidly secured to the border of thebuilding opening so that they in effect constitute a rigid support forthe structure.

Mounted at the weather side of the building opening is a windowconstruction indicated generally at 20. which comprises stationary frameelements 21, 22, 23, 24, and 25. The frame element 22 extendshorizontally across an intermediate portion of the window frame andprovides an upper opening which is closed by a movable ventilator 26 anda lower opening which is closed by a similar movable ventilator 28. The

ventilators 2'6 and 28 may be .of standard construction and standardmounting but are illustrated herein as mounted for outward swinging-movement. They are interconnected 'for such movement by a link Bdwhichinterconnects arms 3| and 32 provided on the ventilator frame. Suitableoperating mechanism is indicated at 34 and includes an operating handle36 accessible from the interior of the room. The operating mechanism iseffective to move the lower portion of the ventilator 2B outwardly andthis motion will be transmitted to the upper ventilator 26 through themedium of the link previouslydefined.

The psychiatric screen construction comprises a rigid, frame made up ofa plurality of rigid bars, the upper bar as indicated in Figure 1 at 40and the lower bar at 42. The side bars are indicated at 44 and 46 inFigure 3. The bars are of identical cross section and are suitably.

interconnected at the corners of the frame as by welding. As best seenin Figure 3, the rigid frame construction is adapted to seat in thewindow casing, the vertical elements l4 and I6 thereof having seats 50formed therein. At the top and bottom the frame seats against flangedelements 5| and 52 respectively. The frame is provided with a hingeindicated generally at 54 which is concealed when the window is inclosed position as indicated in Figure 3, but which operates to exposethe outer edge of-the side bar 44 when the screen frame is swung to openposition.

Referring now to Figure 2 the detailed construction of the screen frameand of the screen carried thereby is best illustrated. In this figurethe screen frame bar 40 is illustrated as formed of a single piece ofsheet metal bent to form a main portion 60 and an inwardly extendingflange portion 6|. The flange portion 6| at its inner edge is inclinedas indicated at 62 and is reversely bent as indicated at 63.

The central opening intermediate the bars of the frame is closed byscreen cloth 65 which is of course selected for its strength so as to beable to withstand abuse in use. At each of the four edges of the screencloth 65 there is provided a separate strip 10 which also is formed of asingle piece of sheet metal. The strip 10 is shaped to provide a mainchannel portion H and an oppositely facing relatively small channel 12at its inner edge. The edge of the screen cloth 65 is secured to thestrip in any suitable manner but preferably it is splined into'thegroove or channel 12, suitable splining material for this purpose beingindicated in Figure 2 at 14.

Each ofthe strips 10 is connected only to the screen cloth and theseveral strips are thus independent of each other-and are independentlymovable.

The screen composed'of the screen cloth 65 and the several strips 10 areretained in the opening of the screen frame 40 by suitable tensionmeans. This tension means is illustrated in Figure 2 as comprising abolt 15 having a rounded head 16 located within the hollow box sectionof the main portion 60 of the screen frame. Located within the channel Hof the strip 10 is a spring abutment which is in the form of a nut 11threaded to the bolt 15. Preferably the nut TI is provided with at leastone elongated flat side in contact with the bottom wall of the channel1! so that rotation of the bolt 15 will result in adjustment of springtension. The bolt 15 passes through an opening 18 formed in the innerwall 19 of the bar 40 and passes through a similar opening 80 providedin the outer wall- 8| of the channel portionH. The outer wall 82 of theframe bar is provided with an opening 83 to provide access to the headof the bolt 15.

Received within the channel H is a compres-- sion spring and as will bereadily apparent, rotation of the bolt 15 as by a screw driver insertedthrough the opening 83, will result in adjustment of the compression ofthe spring 15 and hence of its effectiveness. Preferably, the open sideof the channel 'H is closed in use, and in Figure 2 there is illustrateda sheet metal cover 81 which is adapted to be snapped in place. It willbe understood that as seen in Figure 2, the left side of the screen isthe weather side and the right side of the screen is the room side.

The parts are so arranged that a relatively great tension is applied tothe screen cloth 65 by the compression springs 85. The number ofcompression springs spaced along both the vertical and horizontal framebars may be as desired and will of course depend upon the strength ofthe springs employed. However, it is emphasized that relatively strongtension may be conveniently applied in the manner illustrated.

The parts are constructed and arranged so that in normal position thescreen cloth 65 rests against the weather side of the flange portion 6|of the frame bars. If a relative strong local force is applied to theportion of the screen cloth directly adjacent one of the flanges 6|, twothings occur. Inthe first place the screen yields, a further compressionof the spring 85 taking place as a result. In the second place thescreen is forced outwardly away from the flange 6|, this taking place inpart as a rocking movement of the strip 10 about a pivot axis determinedsubstantially by the engagement between the rounded head 15 of the boltand the opening 18. Thus as the screen is moved away from the flange itis not subjected to any wear, rubbing or hammering. It will be observedthat the frame members such as 40, are provided with a single inwardlyextending flange so that as the screen and border strips are forced awayfrom the flange, there is no other structural element on' the frame barswhich they can engage.

Inasmuch as the screen structure serves in part as a detention screen itis essential to provide secure locking means which will prevent removalof the screen or unauthorized tampering with its elements. In Figure 3there is illustrated a locking bolt which extends through the walls 9|and 92 of the frame bar 46. Preferably, the bolt 90 is one of aplurality of such locking bolts, three normally being provided. In orderto effect simultaneous actuation of the bolts they are provided withlaterally extending actuators 93 which extend into cam slots 94 providedin a vertical movable bar 95. Suitable locking means are provided forpreventing unauthorized shifting of the bar 95 to efiect movementof thebolts 90.

Referring now to Figures 4 and 5 there is illustrated a modified form ofthe present invention. In this case, the casing is indicated at I00 andsuitably received within the casing is the rigid screen frame I02. InFigure 4 a hinge connection [04 is indicated between the screen frameand the casing. The screen frame comprises an inwardly extending flangeI06 which is located on the room side of the screen. The opposite sideof the screen frame and extending inwardly thereof a lesser distance, isa flange I08 which supports a pivot pin I I0. Pivoted to the pin H0 is acurved strip I 12 to the opposite end of which is secured an edge of thescreen cloth N4, the connection in this instance being effected by aclamping strip H6 screwed or otherwise secured to the strip H2. Arelatively strong leafspring III! is provided around the pivot pin H0and has laterally extending cars which engage the adjacent portions ofthe flange M12 and the curved strip I I2. The leaf spring I I8 isdesigned to provide a relatively great force tending to rotate the stripH2 in a clockwise direction as seen in Figure 4. Obviously of course, aseparate strip such as II2 will be provided at the top, bottom and eachsideofthe screen cloth II4.

In this case when a force is applied'to the room side of the screencloth (the upper side as viewed in Figure 4), the screen cloth is forcedaway from the flange I96, this motion being permitted by rotation andpossibly some flexing of the curved strip II2. At the same time, whenthe force against the room side of thescreen cloth H4 is discontinued,the leaf spring will effect rotation of the curved strip II2counterclockwise as seen in Figure 4, thus causing the screen cloth toresume its positionin contact with the outwardly curved edge of theflange I99 and also to apply sufiicient tension thereto to keep thescreen smooth and even. Referring now to Figure 6 there is illustrated asomewhat different embodiment of the invention. In this case, the screenframe I29 has a first flange I22 which extends inwardly at the room sidethereof a substantial distance, and a second inturned flange portion I24which is reversely bent as indicated at I29 to provide an outwardlyfacing hook. The border strip I39 of Y the screen cloth I32 is securedto the frame bar I29 by means of a bolt I34 having a headed portion inthe form of a hook as indicated at I95. Again, the bolt I34 carries acompression spring I36 which is retained in compression by an adjustablenut I31.

Referring now to Figure 7 a somewhat different embodiment of theinvention is illustrated. In this case the frame bar is indicated at I49and includes an inwardly extending flange I42 at the room side thereof.The screen cloth I44 is secured to the screen strip I46 through themedium of a separate strip I48 welded to a flat portion I59 provided onthe strip I46. In this case, as in the embodiments previously described,the screen strips I46 are independent and are independently secured tothe adjacent frame bars by suitable tensioning means. In this figurethetensioning means comprises a compression spring I52 seated against a nutI54 carried by an adjusting bolt I55.

Referring now to Figure 8 there is illustrated a somewhat difierentembodiment of the present invention. In this case the rigidlyinterconnected frame bars I19 include a hollow box section I12, theinner wall of which asindicated at I14, has a rounded opening I16 forthe reception of the adjusting bolts I18. Extending inwardly from thehollow box section I12, the-frame bars include an inwardly extendingflange I89, the inner .portion of which is inturned as indicated at I82and the edge of which is reversely-bentas indicated at I84. Locatedwithin the rigid frame provided by the framebars I19 is the screen clothI86 supported at its edges by four separate border strips I98. As in themodifications previously described the border strips are independent ofeach other and are resiliently urged outwardly by meansof compressionsprings I99. In order to accomplish this result each of the strips I88comprises an outer flange I92, the edge of which at the weather side ofthe construction is inturned as indicated at I94. From thewall side ofthe flange I92, the strip extends inwardly as indicated at I96 andconnects with a transversely extending portion I98. Inwardly of theframe from the portion I98 is'a flat portion 299 located substantiallymidway between the sides of the construction. The screen cloth I86 issecured to the portion 299 by suitable means. In this figure the screencloth is illustrated as attached to the portion 299 by means of aseparate strip 292 welded thereto. At the inner edge of the portion 299there is a reversely bent out- I wardly inclined flange portion 284. Itwill thus be observed that the strip I88 is generally in a form toprovide housing space for the compres- 2 I9 have inwardly extendingresilient finger portions 2 I4 and 2 I6 so'that they may be readilyremoved and replaced as desired.

A somewhat modified construction is illustrated in Figure 9. In thiscase the turned portion I94 of the flange I92 is provided with aresilient grommet 229 which 'may be formed of rubber or the like.Overlying the rubber grommet or sealing strip 229 is a sheet metal cover222 which may be similar to the cover 2! illustrated in Figure 8. Inthis case however, the doubled portion 224 of the cover 222 does notextend to overlie the space between the wall I14 and the flange I92,since this space is effectively closed by a feather edge 226 of therubber grommet 229. Moreover, the cover strip 222 is provided with aninturned flange 228 which in assembly is hooked over the rubber grommet,the opposite edge of the strip 222 having resilient attaching means suchas illustrated at 2I6 in Figure 8.

Referring now to Figure 10 there is illustrated a somewhat modifiedconstruction. In this case the frame bars 239 are of the sameconfiguration as in the previously disclosed modifications. However, theborder strip 232 is generally reversed as compared to the stripspreviously described 50 that the strip itself in conjunction with theframe bar 239 defines a substantially closed chamber or recess.

More specifically, the border strip 239 comprises an outer end flange234 which is outwardly and reversely bent to define a sealing flange236. The strip is provided with an intermediate portion 238 extendinggenerally parallel to the plane of the'article. At its inner edge theportion 238 is bent transversely as indicated at 249 and thence inwardlyto provide an inwardly extending fiange 242. The wire cloth 244 issecured to the flange 242' as by welding indicated at 248 in conjunctionwith a metal strip 248. Preferably, the outer marginal edge portion ofthe wire cloth is crimped around the outer edge of the strips 248 asindicated at 259.

The mechanism for applying tension to the wire cloth comprises the bolt252 whose head is seated in a "rounded recess 254 provided in the innerwall 256 of the frame bar. At its inner end the bolt 252 has securedthereto a threaded nut 299 which as illustrated is provided with acollar 2B2 adapted to'extend into the end of the helical spring 284. Thebolt 252 extends through an opening 266 provided in the outer end flange234 of the border strip 232. The material surroundtending portion of thescreen frame.

ing the opening 266 may be extended inwardly to form a collar 268 whichmay extend into the outer end of the helical coil spring 264. Thisarrangement permits pre-assembly of the spring and nut assembly beforeplacement of the border strips 232 into the frame 230. Thereafter, thebolts 252 may be introduced through openings 210 formed in the outerwall 2'12 of the frame bars.

In the modifications illustrated in Figures 8 to 10 it will be observedthat the interior of the mechanism is effectively closed from theweather side. In the first instance, by means of the cover plate 2H] andits outward extension 2I2, in the second instance by the cover plate 222and the associated rubber grommet 220, and in the third case by theflange 236.

In all of the embodiments illustrated it will be observed that thescreen element, comprising the screen cloth and the separate independentstiffening strips located at the edge of the screen cloth, is stronglytensioned in the opening in the screen frame and in normal position islocated against the weathersurface of an inwardly ex- Outward movementof the screen is restrained only by the action of the tensioning meansand no matter how far out the screen may be forced, it does not comeinto engagement with any other fixed element. This of course preventswear on the screen and prevents damage thereto such as would beencountered if the edges of the screen cloth extended into a slot forattachment to the tensioning means.

In the foregoing description attention is directed to the fact that theconstruction resulted in the screen being held against the inwardlyextending flange on the frame bars. It is desirable for the parts to beso arranged that the screen actually contacts the weather side surfaceof these flanges inasmuch as it is important to prevent inmates fromcramming material into the space between the screen and the border framebar. However, it is'appreciated that in practice the screen may assume aposition spaced very slightly from the flange of 'the frame bar.

Accordingly in the claims language has been adopted defining the screenas directly adjacent the weather side of the flanges. This language isintended to mean that the screen is either in contact with or is spaceda very slight distance from the weather side of the flanges.

To avoid confusion in the terms employed the following explanation ismade: The term "room side" is applied to designate ardirection orlocation of parts at the side of the window located interiorly of thebuildingf The term weather side" is applied to indicate a direction orlocation of parts at the outside of the building, or in other words, atthe side of the construction exposed to the weather. The term inner isused to designate a direction or location of parts inwardly of thewindow opening from the side edges thereof. The term outer is used todesignate a direction or location of parts outwardly of the windowopening from the centerithereof. Thus, in the embodiment of theinvention disclosed in Figure 8, the screen strips I88 are locatedinwardly of the hollow box section I12 of the frame bars. The flange I98of the screen strip is located inwardly of the flange I92. The screenstrip I88 is located at the weather side of the flange I80. The flangeI80 is located atthe room side of the frame bars I10.

The drawings and the foregoing specification,

constitute a description of the improved psychiatric window constructionin such full, clear, concise and exact terms as to enable any personskilled in the art to practice the invention, the scope of which isindicated by the appended claims.

What I claim as my invention is:

1. Psychiatric window construction comprising a rigid frame formed ofbars of hollow rectangular section each having room side, inside,weather side and outside walls, the room side wall continuing inwardlybeyond said inside wall and having an inner edge portion locatedsubstantially midway between the room side and weather side walls, ascreen in said frame comprising a screen cloth having separate rigidstrips secured to its edges, the edges of said screen being locatedinwardly of the inner walls of said bars and said screen cloth beingdirectly adjacent the weather side edge of said inner edge portion, saidstrips having inner edge portions angularly disposed to the plane of thescreen and having free edges substantially coplanar with the weatherside walls of said bars, removable closures secured to said strips andmovable therewith, said closures having portions overlying the weatherside walls of said bars, and resilient means concealed by said closuresinterconnecting said bars and said strips and tensioning said screen.

2. Structure as defined in claim 1 in which said resilient meanscomprise compression springs, and means for adjusting said springscomprising threaded members extending through the inner walls of saidbars, the outer walls thereof having openings for affording access tosaid threaded members.

3. Psychiatric screen structure for a window opening comprising a rigidborder frame surrounding the opening, said frame comprising barsconnected at their ends and each comprising a wall perpendicular to theplane of the window opening and a single flange extending inwardly ofthe window opening at the room side edge of said wall, a screen mountedunder lateral tension within said frame, said screen comprising a screencloth, rigid screen strips secured to the edges of said screen cloth,said strips being independent of each other and relatively movable, eachof said strips being located inwardly of the window opening from thesaid wall of the adjacent bar and closely adjacent to the weather sideof the adjacent flange thereof and freely movable away from the weatherside of said flange, supporting means for said frame, said framesupporting means and said frame with the exception of the said flangesbeing located in their entirety outwardly beyond the edges of saidscreen, and resilient means connecting each of said strips to theadjacent wall of said border frame.

4. Structure as defined in claim 3 in which said strips each comprises apair of channels, one of said channels constituting means for receivingsaid resilient means, the other of said channels constituting a grooveinto which an edge of the screen cloth is splined.

5. Structure as defined in claim 3 in which each of said stripscomprises a channel having inner and outer side walls which extendperpendicular to the plane of the window opening, and said resilientmeans comprises compression springs located between the opposite sidewalls of said channel and seated against the outer side wall thereof,and adjusting members extending 9 through said springs, said membershaving heads engaging said springs at the side thereof inwardly of saidwindow opening and heads engaging the outer side of the wall of theadjacent bar 6. Structure as defined in claim in which the open sides ofsaid channels face toward the flange of the adjacent frame bar to definea chamber therewith protecting and concealing said springs.

7. Structure as defined in claim 6 in which said strips have outwardlyextending flanges at the weather side thereof overlying the weather sideof said border frame bars and closing the space between said bars andstrips.

8. Structure as defined in claim 5 in which the said walls of said barsare provided with enlarged openings through which said members extend,and the last mentioned heads of said members are rounded to provide forrocking of said members.

9. Structure as defined in claim 5 in which said channels are open atthe weather side thereof, and comprise removable cover plates carried bysaid channels and closing the open side of said channels.

10. Structure as defined in claim 9 in which said covers include lateralprojections overlying the space between said strips and the said wallsof said bars.

11. Structure as defined in claim 3 in which each of said flangesincludes an inclined portion at the free inner edge thereof extendingtoward the weather side of the opening, and said channel strips eachinclude a flange extending inwardly from the edge of the inner side wallof said channel into proximity to the edge of the inclined portion.

12. In a psychiatric screen construction, a screen comprising a screencloth, rigid strips secured to the edges of said cloth, said stripsbeing separate and independently movable, each of said strips comprisinga channel portion having inner and outer side walls perpendicular to theplane of the screen, said outer side walls having free edges, the innerside wall having an edge terminating in a plane intermediate the weatherand room side edges of said outer side wall, a flange extending inwardlyof the window opening from the edge of said inner side wall, the edgesof said cloth being secured to said flanges, each of said strips havinga second flange at the inner edge of said first mentioned flangeextending laterally therefrom and terminating in a free edge coplanarwith the free edges of the outer side walls of said channels, and aremovable cover releasably engaging the free edge of said outer sidewall and the free edge of said second flange of each of said strips. I

13. In a screen construction, a rigid frame formed of bars of hollowsection interconnected at their corners, each of said bars having a roomside, inside, weather side and outside Wall, the room side wallcontinuing inwardly beyond said inside wall, a screen within said framecomprising a screen cloth having independently movable rigid stripssecured to its edges, said strips each including a channel openingtransversely of the plane of the frame and having spaced inner and outerside walls, means securing the edges of said screen cloth to the innerside walls of the channels of said strips, tensioning springs in saidchannels, the inside wall of said bars and the outer side walls of saidchannels having aligned openings, and adjusting members extendingthrough said openings and having abutments on their inner ends engagingsaid springs, and abutments on their outer ends engaging the outersurfaces of the inside walls of said bars.

14. Structure as defined in claim 13 in which the openings in the insidewalls of said bars are enlarged, and the abutments on the outer ends ofsaid members are rounded to facilitate rocking of said members.

15. Structure as defined in claim 13 in which said channels are open atthe weather side of said strips to expose said springs to the weather,and protective covers removably carried by each of said strips andmovable therewith to close said channels.

16. Structure as defined in claim 13 comprising a separate detachablecover carried by each of said strips in position to close the channeltherein.

17. Structure as defined in claim 16 in which said covers includelaterally projecting flanges overlying the spaces between said stripsand the inside walls of said bars.

18. In a psychiatric window, a rigid frame comprising frame barsinterconnected at their corners, a screen structure therein comprising ascreen cloth, rigid screen supporting and tensioning strips connected tothe edges of said screen cloth, said strips being independent of eachother for individual yielding movement, each of said strips comprising achannel having inner and outer walls, said outer walls having freeedges, means securing the edges of said screen cloth to the innerchannel walls, spring tensioning means within said channels andconnected to the adjacent frame bars, and cover strips releasablysecured to said channels to close the open sides thereof.

19. Structure as defined in claim 18 in which the means securing theedges of said screen cloth to the inner walls of said channel comprisesflange means extending inwardly from the inner walls of said channelsand located intermediate the weather side and room side of the outerwalls of said channels, said flange means including edge parts locatedinwardly of and substantially coplanar with the free edges of the outerwalls of said channels, said cover strips being detachably secured toand extending between said free edges and edge parts.

JOSEPH F. HEINTZEL.

REFERENCES (JITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,099,959 Wylie June 16, 19141,705,132 iNorquest Mar. 12, 1929 1,917,579 Galeener July 11, 19332,197,489 'Irulock Apr. 16, 1940 2,385,585 Pillsbury Sept. 25, 19452,417,711 Smith Mar. 18, 1947 2,436,277 Willett Feb. 17, 1948

